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COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report <br /> Client- EMCON Service Request: S951019 <br /> Protect: 1775-220 001 /TO# 17075 00/2076 Lodi Date Collected: 8111195 <br /> Sample Matrix, Water Date Received: 8116195 <br /> Date Extracted: NA <br /> Date Analyzed: 8124195 <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/CaIrforma DHS LUFT Method <br /> Percent Recovery <br /> Sample Name Lab Code a,a,a-Tnfluorotoluene <br /> MW-1 (61) S951019-001 87 <br /> MW-2 (62) 5951019-002 92 <br /> MW-3 (62) 5951019-003 92 <br /> MW-4(62) 5951019-004 88 <br /> MW-2 (62) MS 5951019-002MS 97 <br /> MW-2 (62)DMS 5951019-002DMS 101 <br /> Method Blank 5950824-WB 88 <br /> CAS Acceptance Limits 69-116 <br /> SUR11962994 <br /> Page 5 <br />